c4d3c19b4c
Reviewed-by: Richard Levitte <levitte@openssl.org> (Merged from https://github.com/openssl/openssl/pull/5851)
192 lines
5 KiB
Text
192 lines
5 KiB
Text
=pod
|
|
|
|
=head1 NAME
|
|
|
|
openssl-ecparam,
|
|
ecparam - EC parameter manipulation and generation
|
|
|
|
=head1 SYNOPSIS
|
|
|
|
B<openssl ecparam>
|
|
[B<-help>]
|
|
[B<-inform DER|PEM>]
|
|
[B<-outform DER|PEM>]
|
|
[B<-in filename>]
|
|
[B<-out filename>]
|
|
[B<-noout>]
|
|
[B<-text>]
|
|
[B<-C>]
|
|
[B<-check>]
|
|
[B<-name arg>]
|
|
[B<-list_curves>]
|
|
[B<-conv_form arg>]
|
|
[B<-param_enc arg>]
|
|
[B<-no_seed>]
|
|
[B<-rand file...>]
|
|
[B<-writerand file>]
|
|
[B<-genkey>]
|
|
[B<-engine id>]
|
|
|
|
=head1 DESCRIPTION
|
|
|
|
This command is used to manipulate or generate EC parameter files.
|
|
|
|
=head1 OPTIONS
|
|
|
|
=over 4
|
|
|
|
=item B<-help>
|
|
|
|
Print out a usage message.
|
|
|
|
=item B<-inform DER|PEM>
|
|
|
|
This specifies the input format. The B<DER> option uses an ASN.1 DER encoded
|
|
form compatible with RFC 3279 EcpkParameters. The PEM form is the default
|
|
format: it consists of the B<DER> format base64 encoded with additional
|
|
header and footer lines.
|
|
|
|
=item B<-outform DER|PEM>
|
|
|
|
This specifies the output format, the options have the same meaning and default
|
|
as the B<-inform> option.
|
|
|
|
=item B<-in filename>
|
|
|
|
This specifies the input filename to read parameters from or standard input if
|
|
this option is not specified.
|
|
|
|
=item B<-out filename>
|
|
|
|
This specifies the output filename parameters to. Standard output is used
|
|
if this option is not present. The output filename should B<not> be the same
|
|
as the input filename.
|
|
|
|
=item B<-noout>
|
|
|
|
This option inhibits the output of the encoded version of the parameters.
|
|
|
|
=item B<-text>
|
|
|
|
This option prints out the EC parameters in human readable form.
|
|
|
|
=item B<-C>
|
|
|
|
This option converts the EC parameters into C code. The parameters can then
|
|
be loaded by calling the get_ec_group_XXX() function.
|
|
|
|
=item B<-check>
|
|
|
|
Validate the elliptic curve parameters.
|
|
|
|
=item B<-name arg>
|
|
|
|
Use the EC parameters with the specified 'short' name. Use B<-list_curves>
|
|
to get a list of all currently implemented EC parameters.
|
|
|
|
=item B<-list_curves>
|
|
|
|
If this options is specified B<ecparam> will print out a list of all
|
|
currently implemented EC parameters names and exit.
|
|
|
|
=item B<-conv_form>
|
|
|
|
This specifies how the points on the elliptic curve are converted
|
|
into octet strings. Possible values are: B<compressed>, B<uncompressed> (the
|
|
default value) and B<hybrid>. For more information regarding
|
|
the point conversion forms please read the X9.62 standard.
|
|
B<Note> Due to patent issues the B<compressed> option is disabled
|
|
by default for binary curves and can be enabled by defining
|
|
the preprocessor macro B<OPENSSL_EC_BIN_PT_COMP> at compile time.
|
|
|
|
=item B<-param_enc arg>
|
|
|
|
This specifies how the elliptic curve parameters are encoded.
|
|
Possible value are: B<named_curve>, i.e. the ec parameters are
|
|
specified by an OID, or B<explicit> where the ec parameters are
|
|
explicitly given (see RFC 3279 for the definition of the
|
|
EC parameters structures). The default value is B<named_curve>.
|
|
B<Note> the B<implicitlyCA> alternative, as specified in RFC 3279,
|
|
is currently not implemented in OpenSSL.
|
|
|
|
=item B<-no_seed>
|
|
|
|
This option inhibits that the 'seed' for the parameter generation
|
|
is included in the ECParameters structure (see RFC 3279).
|
|
|
|
=item B<-genkey>
|
|
|
|
This option will generate an EC private key using the specified parameters.
|
|
|
|
=item B<-rand file...>
|
|
|
|
A file or files containing random data used to seed the random number
|
|
generator.
|
|
Multiple files can be specified separated by an OS-dependent character.
|
|
The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
|
|
all others.
|
|
|
|
=item [B<-writerand file>]
|
|
|
|
Writes random data to the specified I<file> upon exit.
|
|
This can be used with a subsequent B<-rand> flag.
|
|
|
|
=item B<-engine id>
|
|
|
|
Specifying an engine (by its unique B<id> string) will cause B<ecparam>
|
|
to attempt to obtain a functional reference to the specified engine,
|
|
thus initialising it if needed. The engine will then be set as the default
|
|
for all available algorithms.
|
|
|
|
=back
|
|
|
|
=head1 NOTES
|
|
|
|
PEM format EC parameters use the header and footer lines:
|
|
|
|
-----BEGIN EC PARAMETERS-----
|
|
-----END EC PARAMETERS-----
|
|
|
|
OpenSSL is currently not able to generate new groups and therefore
|
|
B<ecparam> can only create EC parameters from known (named) curves.
|
|
|
|
=head1 EXAMPLES
|
|
|
|
To create EC parameters with the group 'prime192v1':
|
|
|
|
openssl ecparam -out ec_param.pem -name prime192v1
|
|
|
|
To create EC parameters with explicit parameters:
|
|
|
|
openssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit
|
|
|
|
To validate given EC parameters:
|
|
|
|
openssl ecparam -in ec_param.pem -check
|
|
|
|
To create EC parameters and a private key:
|
|
|
|
openssl ecparam -out ec_key.pem -name prime192v1 -genkey
|
|
|
|
To change the point encoding to 'compressed':
|
|
|
|
openssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed
|
|
|
|
To print out the EC parameters to standard output:
|
|
|
|
openssl ecparam -in ec_param.pem -noout -text
|
|
|
|
=head1 SEE ALSO
|
|
|
|
L<ec(1)>, L<dsaparam(1)>
|
|
|
|
=head1 COPYRIGHT
|
|
|
|
Copyright 2003-2018 The OpenSSL Project Authors. All Rights Reserved.
|
|
|
|
Licensed under the OpenSSL license (the "License"). You may not use
|
|
this file except in compliance with the License. You can obtain a copy
|
|
in the file LICENSE in the source distribution or at
|
|
L<https://www.openssl.org/source/license.html>.
|
|
|
|
=cut
|